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Date Posted: 06:57:32 06/20/01 Wed
Author: Michel
Subject: Re: How to change the palette of a 256 color TBitmapGraphic?
In reply to: wto 's message, "Re: How to change the palette of a 256 color TBitmapGraphic?" on 19:50:44 06/19/01 Tue


Hi,

I will look into this in detail and I will create a test project.

Best regards,

Michel

>Yes, I've refreshed it(Invalidate is also tried), but
>nothing happens.
>
>>
>>Hi,
>>
>>Did you invalidate your display component, for
>example,
>>
>>Image.Invalidate or ImageScrollBox.Redraw(True) ?
>>
>>Best regards,
>>
>>Michel
>>
>>>I've tried it under 256 display mode and true-color
>>>mode,
>>>all have no effect after the change of palette.
>>>
>>>>Thank you for your answer, but after I apply
>>following
>>>>code to a TBitmapGraphic, nothing happens:
>>>>
>>>> for I := 0 to 255 do
>>>> begin
>>>>
>>BitmapGraphic.PalettePtr^.palPalEntry[I].peRed
>>>>:= 0;
>>>>
>>>>BitmapGraphic.PalettePtr^.palPalEntry[I].peGreen
>>:=0;
>>>>
>>BitmapGraphic.PalettePtr^.palPalEntry[I].peBlue
>>>> := 0;
>>>>
>>>>BitmapGraphic.PalettePtr^.palPalEntry[I].peFlags :=
>>>>PC_RESERVED;
>>>> end;
>>>>Why?
>>>>
>>>>>
>>>>>Hi,
>>>>>
>>>>>Sorry about that, I looked too quickly. Use,
>>>>>
>>>>>BitmapGraphic.PalettePtr^.palPalEntry[N].peRed :=
>X;
>>>>>
>>>>>Best regards,
>>>>>
>>>>>Michel
>>>>>>Thank you for your answer, but the property of
>>>>>>TDibGraphic.Palette is read only, so when I
>written
>>>>>>code like this:
>>>>>> BitmapGraphic.Palette.palPalEntry[N].peRed :=
>X;
>>>>>>The Delphi compiler will said "Left side
>cannot
>>>>assign
>>>>>>to" .
>>>>>>
>>>>>>>
>>>>>>>Hi,
>>>>>>>
>>>>>>>The TBitmapGraphic already exposes the palette
>>from
>>>>>>>the TDibGraphic base class.
>>>>>>>
>>>>>>>For example, you can change an entry,
>>>>>>>
>>>>>>>BitmapGraphic.Palette.palPalEntry[N].peRed := X;
>>>>>>>
>>>>>>>Best regards,
>>>>>>>
>>>>>>>Michel
>>>>>>>
>>>>>>>>Hi,
>>>>>>>> I'm trying to change the palette of a 256
>color
>>>>>>>>TBitmapGraphic like this:
>>>>>>>>var
>>>>>>>> Pal: array[0..255] of TPaletteEntry;
>>>>>>>> Image: TImage;
>>>>>>>>begin
>>>>>>>> Image := TImage.Create;
>>>>>>>> Image.Picture.Graphic :=
>TBitmapGraphic.Create;
>>>>>>>> for I := 0 to 255 do
>>>>>>>> begin
>>>>>>>> Pal[i].peFlags:=PC_RESERVED;
>>>>>>>> Pal[i].peRed:=Random(255);
>>>>>>>> Pal[i].peGreen:=Random(255);
>>>>>>>> Pal[i].peBlue:=Random(255);
>>>>>>>> end;
>>>>>>>> if
>>>>>>>>SetPaletteEntries(TBitmapGraphic(image.picture.G
>r
>>a
>>>p
>>>>h
>>>>>i
>>>>>>c
>>>>>>>)
>>>>>>>>.PaletteHandle, 0, 256, Pal) <> 0 then
>>>>>>>>
>>>>>>>>RealizePalette(TBitmapGraphic(image.picture.Grap
>h
>>i
>>>c
>>>>)
>>>>>.
>>>>>>D
>>>>>>>C
>>>>>>>>);
>>>>>>>>
>>>>>>>> but the image will not change at all! What is
>>>the
>>>>>>>>problem?

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